[issue37859] time.process_time() constant / erratic on Windows

[Red Glyph]

New submission from Red Glyph :

Tested with 
- Python 3.7.4, 64-bit, Windows version (installer version)
- python-3.8.0b3-embed-amd64.zip
- python-3.7.2.post1-embed-amd64.zip 
on Windows 7 x64 Professional

time.process_time() always returns the same value. If I check the value of 
time.process_time_ns(), sometimes it is constant, sometimes I observe a few 
changes, then it becomes constant too.

Here is a log of an example session, I'm waiting at least 1-2 seconds between 
each command:

Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
>>> import time
>>> time.process_time()
0.1092007
>>> time.process_time()
0.1092007
>>> time.process_time_ns()
109200700
>>> time.process_time_ns()
124800800
>>> time.process_time_ns()
124800800
>>> time.process_time()
0.1248008
>>> time.process_time()
0.1248008
>>> time.process_time()
0.1248008
>>> time.process_time_ns()
124800800
>>> time.process_time_ns()
124800800
>>> time.process_time_ns()
124800800
>>> time.process_time_ns()
124800800
>>> time.clock()

Warning (from warnings module):
  File "__main__", line 1
DeprecationWarning: time.clock has been deprecated in Python 3.3 and will be 
removed from Python 3.8: use time.perf_counter or time.process_time instead
77.006126126
>>> time.clock()
79.245575778
>>> time.clock()
80.801103036
>>> time.process_time()
0.1248008
>>>

--
components: Library (Lib), Windows
messages: 349745
nosy: Red Glyph, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: time.process_time() constant / erratic on Windows
type: behavior
versions: Python 3.7, Python 3.8

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[issue37859] time.process_time() constant / erratic on Windows

[Red Glyph]

Change by Red Glyph :


--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue37859] time.process_time() constant / erratic on Windows

[Red Glyph]

Red Glyph  added the comment:

I see that now. The behaviour was different in Linux, though, I suppose it may 
benefit from a more precise counter, but since in Windows it also has a precise 
counter with time.perf_counter_ns(), I was expecting to see that value change, 
but it was mainly a confusion with the older time.clock().

Thanks!

--

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